arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.14607astro-ph.HE
收藏

中子星低质量X射线双星GX 13+1的热辐射风

The thermal-radiative wind in the neutron star low mass X-ray binary GX 13+1

Ryota Tomaru, Chris Done, Ken Ohsuga, Hirokazu Odaka, Tadayuki Takahashi

摘要:

我们拟合观测到的高电离X射线吸收线的中子星双星GX 13 +1与一个完整的模拟的热辐射风。这使用辐射流体动力学代码耦合到蒙特卡罗辐射转移来计算从氢和氦类铁和镍中观察到的谱线轮廓,包括所有强Kα和Kβ跃迁。风是非常强大的,因为这个对象有一个非常大的圆盘,是非常发光。当离子柱较大时,Fe Kα的吸收谱线强烈饱和,因此谱线等效宽度(EW)对速度结构敏感。我们还模拟了包括各向同性湍流水平的方位角和径向速度的线。我们将这些模型拟合到最高分辨率Chandra三阶HETGS数据中看到的Fe XXV和XXVI吸收线。这些数据已经排除了在~500 km/s的径向速度水平上增加湍流。由热辐射风单独预测的速度结构与观测到的廓线相当吻合,在方位角速度约为100 km/s的水平上,额外湍流的上限。这对来自磁加速度的任何剩余贡献给出了严格的约束。

英文摘要:

We fit the observed high ionisation X-ray absorption lines in the neutron star binary GX13+1 with a full simulation of a thermal-radiative wind. This uses a radiation hydrodynamic code coupled to Monte Carlo radiation transfer to compute the observed line profiles from Hydrogen and Helium-like iron and Nickel, including all strong Kα and Kβ transitions. The wind is very strong as this object has a very large disc and is very luminous. The absorption lines from Fe Kα are strongly saturated as the ion columns are large, so the line equivalent widths (EWs) depend sensitively on the velocity structure. We additionally simulate the lines including isotropic turbulence at the level of the azimuthal and radial velocities. We fit these models to the Fe xxv and xxvi absorption lines seen in the highest resolution Chandra third order HETGS data. These data already rule out the addition of turbulence at the level of the radial velocity of ~500 km/s. The velocity structure predicted by the thermal-radiative wind alone is a fairly good match to the observed profile, with an upper limit to additional turbulence at the level of the azimuthal velocity of ~100 km/s. This gives stringent constraints on any remaining contribution from magnetic acceleration.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑